397040240 has 20 divisors (see below), whose sum is σ = 923118744. Its totient is φ = 158816064.

The previous prime is 397040221. The next prime is 397040243. The reversal of 397040240 is 42040793.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397040243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2481422 + ... + 2481581.

Almost surely, 2^397040240 is an apocalyptic number.

It is an amenable number.

397040240 is an abundant number, since it is smaller than the sum of its proper divisors (526078504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

397040240 is a wasteful number, since it uses less digits than its factorization.

397040240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4963016 (or 4963010 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 397040240 is about 19925.8686134382. The cubic root of 397040240 is about 734.9844907027.

The spelling of 397040240 in words is "three hundred ninety-seven million, forty thousand, two hundred forty".